This is a look at the level 88 warlock ability being added for Mists of pandaria its called Demonic Gateway and it looks awesome! "Create a demonic gateway between two locations. Stepping into the gateway causes any party member to be instantly transported to the other gateway.

Limit 5 charges. The portal generates one charge every 15 seconds."

There may be limitations on the spell that are currently unclear but in general this looks to be an awesome addition to the warlock class.